widget refresh enhancements

lib/widget_data/widget_data_mapper.dart

@@ -9,6 +9,7 @@ import '../api/marianumconnect/queries/timetable_get_timegrid/timetable_get_time
 import '../api/marianumconnect/queries/timetable_get_week/timetable_get_week_response.dart';
 import '../api/mhsl/custom_timetable_event/custom_timetable_event.dart';
 import '../api/mhsl/custom_timetable_event/get/get_custom_timetable_event_response.dart';
+import '../extensions/date_time.dart';
 import '../view/pages/timetable/data/lesson_merger.dart';
 import '../view/pages/timetable/data/lesson_period_schedule.dart';
 import '../view/pages/timetable/data/lesson_status.dart';
@@ -34,12 +35,20 @@ class WidgetDataMapper {
     return candidate;
   }
 
-  static DateTime resolveWeekAnchor(DateTime now) {
-    final anchor = resolveDayAnchor(now);
-    final monday = anchor.subtract(Duration(days: anchor.weekday - 1));
+  static DateTime resolveWeekAnchor(DateTime now) =>
+      startOfCalendarWeek(resolveDayAnchor(now));
+
+  /// Monday of the calendar week containing [reference] — no roll-forward,
+  /// unlike [resolveWeekAnchor]. Start of the week payload's 14-day window.
+  static DateTime startOfCalendarWeek(DateTime reference) {
+    final monday = reference.subtract(Duration(days: reference.weekday - 1));
     return DateTime(monday.year, monday.month, monday.day);
   }
 
+  /// Days covered by the week payload: current calendar week + the next, so
+  /// native renderers can roll the view forward without fresh data.
+  static const int weekWindowDays = 14;
+
   static WidgetTimetableData buildDayData({
     required DateTime now,
     required Iterable<McTimetableEntry> lessons,
@@ -83,10 +92,14 @@ class WidgetDataMapper {
     bool connectDoubleLessons = true,
   }) {
     final anchor = resolveWeekAnchor(now);
-    final endExclusive = anchor.add(const Duration(days: 5));
+    // The window is anchored at the *current* calendar week, not the
+    // (possibly rolled-forward) week anchor: on Friday evening the payload
+    // must still contain today for renderers that derive day slices.
+    final windowStart = startOfCalendarWeek(now);
+    final endExclusive = windowStart.add(const Duration(days: weekWindowDays));
     final weekLessons = lessons.where((l) {
       final dt = l.startDateTime;
-      return !dt.isBefore(anchor) && dt.isBefore(endExclusive);
+      return !dt.isBefore(windowStart) && dt.isBefore(endExclusive);
     }).toList();
     // Per-day merge: otherwise a 4th-period lesson on Mon would collapse with
     // a 1st-period lesson on Tue if subject/teacher match.
@@ -95,13 +108,38 @@ class WidgetDataMapper {
         : weekLessons;
     final mapped = <WidgetLesson>[
       ...source.map((l) => _mapLesson(l, now, subjects, rooms)),
-      ..._expandCustomEvents(customEvents, anchor, endExclusive),
+      ..._expandCustomEvents(customEvents, windowStart, endExclusive),
     ]..sort((a, b) => a.start.compareTo(b.start));
+    final days = [
+      for (var i = 0; i < weekWindowDays; i++)
+        _dayInfo(windowStart.addDays(i), holidays),
+    ];
+    // The anchor always lies inside the window; the orElse only guards the
+    // impossible.
+    final anchorInfo = days.firstWhere(
+      (d) => d.date == anchor,
+      orElse: () => _dayInfo(anchor, holidays),
+    );
     return WidgetTimetableData(
       fetchedAt: now,
       anchorDate: anchor,
       lessons: _resolveCollisions(mapped),
       periods: _resolvePeriods(timegrid),
+      isHoliday: anchorInfo.isHoliday,
+      holidayName: anchorInfo.holidayName,
+      days: days,
+    );
+  }
+
+  static WidgetDayInfo _dayInfo(
+    DateTime day,
+    TimetableGetHolidaysResponse? holidays,
+  ) {
+    final holiday = _findHoliday(day, holidays);
+    return WidgetDayInfo(
+      date: day,
+      isHoliday: holiday != null,
+      holidayName: holiday?.longName,
     );
   }